List placeholder shows on top of pasted custom inline element

[lucasavila00]

Describe the bug

See that there's a gray "List" over Steve in this example

To Reproduce

https://www.blocknotejs.org/examples/custom-schema/suggestion-menus-mentions

• Create a list
• Add a mention
• Copy that mention and paste it

[YousefED]

Thanks! We'll look into this